this Super GT series SUPRA was powered by what?

What did the Celica All-Trac Turbo/GT-Four, MR2 Turbo and this 90's Super GT Supra all have in common? Their engine. That's right, K20 MR2 tuners: You're tearing out a distinguished powerplant of historical importance with each one of your perverse conversions!

I also find it interesting that SARD did not use the 3S-GTE in their Le Mans MR2 (MC8-R). They instead opted for a modified 1UZ-FE (4L V8) which can be found in the Toyota Soarer/Crown.